I just repaired my own JM stamped 1894 in .44mag, that got rounds "stuck".
My case is different, but I think could be helpful.
In my case, I loaded 10 rounds to preform a function check before deer season opens.
NEVER wait until the last minute!
Fully loaded with 10 rounds of SJSP 240gr Sellior & Bellot, I worked the lever.
When the lever reached the bottom the gun locked up. Lever wouldn't move, and there were 10 live rounds inside.
I removed the lever screw and lever. When I removed the bolt, the magazine shot out all 10 rounds into my lap.
Upon removing the bolt I now see that the load gate is floating around inside the receiver! BTW- It's not supposed to do that.
O.K. now I have a little over 2 weeks before season starts, and I have a backup, but I wanted to use the 1894.
I came here to ask questions.
Everyone assured me it would be an easy fix, and urged me to search YouTube for a video covering assemble/disassembly of the Marlin 1894.
I did just that and saw it should be easy enough to fix. The load gate screw had broken. I got both pieces out and ordered a new screw.
It came in the mail just the other day and it only took about 20 minutes to completely disassemble, clean, repair, and reassemble.
Now, yours sounds like it could be an easy fix as well.
I'm going to bet it hasn't been deep cleaned in a while. I'm specifically thinking about the magazine tube, and or the magazine follower. If they get dirty enough, and they will eventually, they will stick in the magazine tube and you won't have the spring pressure necessary for proper feeding.
Then again, it could be a lifter issue.
As stated above, you'll need to provide a little better description of the problem.
Someone here can then suggest a remedy.
Good luck